View Compilation Error

0_0_21106833_15934.cpp: In function 'int main()':
0_0_21106833_15934.cpp:31:23: error: 'sort' was not declared in this scope
         sort(C,C+n,cmp)
                       ^
0_0_21106833_15934.cpp:32:21: error: 'i' was not declared in this scope
         for(int i=0;i<n-1; i++)
                     ^